$\frac{d}{dx} \left( \sqrt{3} \sin \left(2x + \frac{\pi}{3} \right) + \cos \left(2x + \frac{\pi}{3} \right) \right) = $ . . . . . .

  • A
    $4 \cos 2x$
  • B
    $-4 \sin 2x$
  • C
    $4 \sin 2x$
  • D
    $-4 \cos 2x$

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यदि $y=(1+x)(1+x^2)(1+x^4) \dots (1+x^{2^n})$ है, तो $\left(\frac{dy}{dx}\right)_{x=0}$ का मान ज्ञात कीजिए।

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